#ifndef __LOG_HPP__
#define __LOG_HPP__

#include <iostream>
#include <cstdio>
#include <string>
#include <filesystem>
#include <sstream>
#include <fstream>
#include <memory>
#include <ctime>
#include <unistd.h>
#include "Mutex.hpp"

namespace LogModule
{
    using namespace MutexModule;

    const std::string gsep = "\r\n";

    //刷新策略基类
    class LogStrategy
    {
    public:
        ~LogStrategy() = default;
        virtual void SyncLog(const std::string& message) = 0;
    };

    //子类：显示器打印
    class ConsoleLogStrategy : public LogStrategy
    {
    public:
        ConsoleLogStrategy()
        {}

        void SyncLog(const std::string& message) override
        {
            LockGuard lockguard(_mutex);
            std::cout << message << gsep;
        }

        ~ConsoleLogStrategy()
        {}
    private:
        Mutex _mutex;
    };

    //子类：文件打印
    const std::string defaultpath = "./log";
    const std::string defaultfile = "my.log";
    class FileLogStrategy : public LogStrategy
    {
    public:
        FileLogStrategy(const std::string& path = defaultpath,const std::string& file = defaultfile)
            :_path(path)
            ,_file(file)
        {
            LockGuard lockguard(_mutex);
            if(std::filesystem::exists(_path))
            {
                return;
            }
            try
            {
                std::filesystem::create_directories(_path);
            }
            catch(const std::filesystem::filesystem_error& e)
            {
                std::cerr << e.what() << '\n';
            }
            
        }

        void SyncLog(const std::string& message) override
        {
            LockGuard lockguard(_mutex);

            std::string filename = _path + (_path.back() == '/' ? "" : "/") + _file;
            std::ofstream out(filename, std::ios::app);
            if(!out.is_open())
                return;
            out << message << gsep;
            out.close();
        }

        ~FileLogStrategy()
        {}

    private:
        std::string _path;
        std::string _file;
        Mutex _mutex;
    };
    
    enum class LogLevel
    {
        DEBUG,
        INFO,
        WARNING,
        ERROR,
        FATAL
    };

    std::string Level12Str(LogLevel level)
    {
        switch (level)
        {
            case LogLevel::DEBUG:
                return "DEBUG";
            case LogLevel::INFO:
                return "INFO";
            case LogLevel::WARNING:
                return "WARNING";
            case LogLevel::ERROR:
                return "ERROR";
            case LogLevel::FATAL:
                return "FATAL";
            default:
                return "UNKNOWN";
            
        }
    }

    std::string GetTimeStamp()
    {
        time_t curr = time(nullptr);
        struct tm curr_tm;
        localtime_r(&curr, &curr_tm);
        char timebuffer[128];
        snprintf(timebuffer, sizeof(timebuffer), "%4d-%02d-%02d %02d:%02d:%02d",
            curr_tm.tm_year + 1900,
            curr_tm.tm_mon + 1,
            curr_tm.tm_mday,
            curr_tm.tm_hour,
            curr_tm.tm_min,
            curr_tm.tm_sec
        );

        return timebuffer;
    }

    class Logger
    {
    public:
        Logger()
        {
            EnableConsoleLogStrategy();
        }

        void EnableConsoleLogStrategy()
        {
            _fflush_strategy = std::make_unique<FileLogStrategy>();
        }

        void EnableFileLogStrategy()
        {
            _fflush_strategy = std::make_unique<ConsoleLogStrategy>();
        }

        class LogMessage
        {
        public:
            LogMessage(LogLevel& level, std::string& src_name, int line_number, Logger& Logger)
                :_curr_time(GetTimeStamp()),
                _level(level),
                _pid(getpid()),
                _src_name(src_name),
                _line_number(line_number),
                _logger(Logger)
            {
                std::stringstream ss;
                ss << "[" << _curr_time << "] "
                 << "[" << Level12Str(_level) << "] "
                 << "[" << _pid << "] "
                 << "[" << _src_name << "] "
                 << "[" << _line_number << "] "
                 << "- ";
                 _loginfo = ss.str();
            }

            template<class T>
            LogMessage& operator<<(const T& info)
            {
                std::stringstream ss;
                ss << info;
                _loginfo += ss.str();
                return *this;
            }

            ~LogMessage()
            {
                if(_logger._fflush_strategy)
                {
                    _logger._fflush_strategy->SyncLog(_loginfo);
                }
            }

        private:
            std::string _curr_time;
            LogLevel _level;
            pid_t _pid;
            std::string _src_name;
            int _line_number;
            std::string _loginfo;
            Logger& _logger;
        };


        LogMessage operator() (LogLevel level, std::string name, int line)
        {
            return LogMessage(level, name, line, *this);
        }

        ~Logger()
        {

        }

    private:
        std::unique_ptr<LogStrategy> _fflush_strategy;
    };

    Logger logger;

    #define LOG(lever) logger(level, __FILE__, __LINE__)
    #define Enable_Console_Log_Strategy() logger.EnableConsoleLogStrategy();
    #define Enable_File_Log_Strategy() logger.EnableFileLogStrategy();

}   

#endif

